<template>
	<view>
		<!-- 自定义的搜素组件 -->	
		<my-search @click="gotoSearch"></my-search> 
		
		<view class="scroll-view-container">
			<!-- 左侧滑动区域 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}" >
				<block v-for="(item,i) in cateList" :key="i">
					<view :class="['left-scroll-view-item', i === active?'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
				</block>
			</scroll-view>
			<!-- 右侧滑动区域 -->
			<scroll-view scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
					<!-- 这是二级分类 标题 -->
					<view class="cate-lv2-title">{{item2.cat_name}}</view>
					<!-- 二级分类下的三级列表 -->
					<view class="cate-lv3-title">
						<!-- 三级分类的item项 -->
						<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodList(item3)">
							<!-- 三级分类的图片 -->
							<image :src="item3.cat_icon"></image>
							<!-- 三级分类的文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'
	
	export default {
		mixins:[badgeMix],
		data() {
			return {
				//当前设备可用高度
				wh: 0,
				//一级分类列表数组
				cateList:[],
				active: 0,
				//二级分类列表数组
				cateLevel2:[],
				scrollTop: 0
			};
		},
		
		onLoad() { 
		const sysInfo = uni.getSystemInfoSync()
		console.log(sysInfo)
		//这是分类的可用高度
		this.wh = sysInfo.windowHeight
		
		this.getCateList()
		},
		
		methods: {
			//获取分类列表的数据
			async getCateList(){
				const {data : res} = await  uni.$http.get('/api/public/v1/categories')
				//数据请求失败后执行
				console.log(res.message[0].children)
				if(res.meta.status !== 200) return uni.$showMsg()
					this.cateList = res.message
					
					uni.$showMsg('数据请求成功！')
					
					//为二级分类复制
					this.cateLevel2 = res.message[0].children
				},
				activeChanged(i){
					this.active = i
					//点击事件之后重新为二级分类赋值
					this.cateLevel2 = this.cateList[i].children
					
					this.scrollTop = this.scrollTop === 0 ? 1 : 0
				},
				//跳转到商品列表页面
				gotoGoodList(item3){
					uni.navigateTo({
						url:'/subpkg/goods_list/goods_list?cid=' + item3.cat_id
					})
				},
				gotoSearch(){
					uni.navigateTo({
						url: '/subpkg/search/search'
					})
				},
		},
	}
</script>

<style lang="scss">
.scroll-view-container{
	display: flex;
}	

.left-scroll-view{
	width: 120px;
}

.left-scroll-view-item{
	background-color: #f7f7f7;
	line-height: 60px;
	text-align: center;
	font-size: 12px;
	
	&.active{
		background-color: #FFFFFF;
		position: relative;
		
		&::before{
			content: ' ';
			display: block;
			width: 3px;
			height: 30px;
			background-color: #c00000;
			position: absolute;
			top: 50%;
			left: 0;
			transform: translateY(-50%);
		}
	}
}

.cate-lv2-title{
	font-size: 12px;
	font-weight: bold;
	text-align: center;
	padding: 15px 0;
}

.cate-lv3-title{
	display: flex;
	flex-wrap: wrap;
	.cate-lv3-item{
		width: 33.33%;
		display: flex;
		flex-direction: column;
		justify-content: center;
		align-items: center;
		margin-bottom: 10px;

		image{
			width: 60px;
			height: 60px;
		}
		text{
			font-size: 12px;
		}
	}
}
</style>
